Invasion of Cayenne (1809) - Invasion

Invasion

The town of Cayenne is situated on an island in the mouth of the Cayenne and Mahury Rivers. In 1809, its approaches were protected by a series of forts and gun batteries, while the town itself was dominated by a modern star fort. Acknowledging that his force was not large enough to invade the island directly, Yeo decided instead to attack a series of outlying forts on the Mahury River in an effort to draw out the French defenders. On 6 January 1809, preparations were complete and Yeo launched an attack during the night, landing at Pointe Mahury at 03:00 on 7 January in five canoes despite heavy rains, which continued throughout the campaign. The surf was strong and all five canoes were wrecked on the beach, but there were no casualties. Yeo detached a Portuguese force under Major Joaquim Manuel Pinto against the Dégras de Cannes battery while he advanced on Fort Diamant with a force of seamen and marines. Both positions were rapidly carried, the British suffering seven men wounded to French losses of six killed and four wounded. Four cannons were seized, as were 90 French soldiers. Both fortifications were then garrisoned with soldiers from the squadron.

With the capture of the Mahury forts, the French in Cayenne risked being cut off from external help and besieged. In response, Governor Victor Hugues mustered most of the 600 troops available to him and marched on the Allied positions. Consolidating his forces at Dégras de Cannes, Yeo demolished Fort Diamant and sent scouts down river, where two further forts were discovered at Trio and the Canal de Torcy. The latter fort had been constructed to defend the approaches to Hugues' residence, which was situated on the canal. Yeo immediately ordered the Portuguese cutters Leão and Vingança into the river to attack the forts, the Portuguese bombarding the positions for an hour while Yeo prepared assault forces. Yeo himself led the attack on the Trio fort while a Portuguese party attacked the fort on the canal. Both positions were captured and their 50 strong garrisons driven off.

As Yeo secured his position from attack from the river, Hugues arrived at Dégras de Cannes. Despite attacking Lieutenant Colonel Marques' garrison immediately, Hugues was unable to defeat the Portuguese before Yeo returned, and was forced to retreat after a three-hour engagement. A secondary force sent against Fort Diamant saw the British demolition party on the walls and, assuming the garrison there to be larger than expected, retreated without an assault. The following morning, as Hugues fell back on his residence, Yeo followed, using the river and canal to close with the position. Hugues had fortified his property with 100 men and two artillery pieces, and ordered his men to fire on a party of British sailors offering a truce. A second attempt was met with cannon fire, and although a third attempt via one of Hugues' slaves drew a response, the French general's overtures were only an attempt to stall the Allies while his men laid an ambush in the trees near their landing point.

At a signal from one of the artillery pieces, the French ambush party began a heavy fire on the troops advancing up the lane towards the house. Charging forward, Yeo led an attack on the ambushers at the head of his men and in hand to hand fighting seized the house and its artillery. Gathering his forces, Yeo then marched on Cayenne, expecting to meet Hugues at the Beauregard plain, where the French general had stationed his remaining 400 men. Reaching the position on 10 January, Yeo sent two junior officers into Cayenne offering an armistice, which was accepted, Hugues recognising that he was outnumbered and outmanoeuvred. Over the next four days, Yeo's men took the surrender of the outlying French garrisons and units, with the entrance to Cayenne planned for 14 January.